zuozhe 中央广播电视总台 2021-12-07 14:43:16
What is an Auto Transformer and Its Working?
Auto transformer refers to a transformer whose primary and secondary windings are on the same winding, and the primary and secondary windings are directly connected in series and self-coupled. According to the structure, it can be subdivided into adjustable pressure type and fixed type. Auto-coupling means electromagnetic coupling. Ordinary transformers transfer energy through the electromagnetic coupling of the primary and secondary coils. There is no direct electrical connection between the primary and secondary sides. The primary and secondary sides of the auto transformer have direct electrical connections. Its low-voltage coils It is part of the high voltage coil. Protective equipment such as auto transformers are also used in protective equipment for communication lines.
What is LCD? Working and Types
LCD is a liquid crystal display. The LCD structure is to place a liquid crystal cell between two parallel glass substrates. LCD has replaced CRT as the mainstream, and the price has dropped a lot, and it has become fully popular.
How does an Inverter Work?
The inverter is a converter that converts DC electric energy into constant frequency and constant voltage AC or Frequency and voltage modulation AC. It is composed of an inverter bridge, control logic, and filter circuit. Inverters are widely used in air conditioners, home theaters, electric grinding wheels, power tools, DVDs, VCD, computers, TVs, washing machines, range hoods, refrigerators, video recorders, massagers, fans, lighting, etc.
What is Uninterruptible Power Supply (UPS)?
UPS is an uninterruptible power supply containing the energy storage device. It is mainly used to give a part of a device with a higher power stability, providing uninterrupted power supplies.
What is a Thermoelectric Cooler?
Thermoelectric Cooler (TEC) is found in many applications that require precision temperature control. The small size of the TEC allows precision thermal control of individual components such as fiber optics, laser drivers, precision voltage references, or any other temperature critical device.
What is an Inverting Amplifier?
The operational amplifier in the electronic circuit has a non-inverting input terminal and an inverting input terminal. The polarity of the input terminal and the output terminal are the same polarity is a non-inverting amplifier, and the polarity of the input terminal and the opposite polarity of the output terminal are called Inverting Amplifier. The inverting amplifier circuit has the function of amplifying the input signal and inverting the output.
Working Principle and Types of Throttle Position Sensor
The throttle position sensor is also known as a throttle opening sensor or a throttle switch. Its main function is to detect the engine is in an idle condition or a load condition. It is an acceleration and reduction. It is essentially a variable resistor and several switches, mounted on the throttle
What is a Ceramic Filter?
Ceramic filter is a widely used filter that uses rigid microporous material as a filter element. It is composed of ceramic, corundum, silicon carbide, sand chip, and so on. It is mainly used in fluidized bed combustion, calcination, power generation through organic waste gasification, building materials, and other fields.
An Overview of SD Card
The SD (Secure Digital) card is a new generation of memory devices based on semiconductor flash memory. Due to its small size, data transmission speed, hot-swap, and other excellent features, it is widely used in portable devices, such as digital cameras, tablets, and multimedia players, etc.
How to Select a Digital Isolator?
A digital isolator is a chip used to make the electronic system have high resistance isolation when signals and analog signals are transmitted, so as to realize the isolation between the electronic system and its users. The reason why designers introduce isolation is to meet safety regulations or reduce ground loop noise.
What is an Application-specific Integrated Circuit?
Application-specific integrated circuits are integrated circuits made for specific users or specific electronic systems. The versatility and mass production of digital integrated circuits have greatly reduced the cost of electronic products and promoted the popularization of computer communications and electronic products. However, at the same time, it has also created the problem of the contradiction between general-purpose and special-purpose, and the disconnection between system design and circuit production.
What is FPC (Flexible Printed Circuit)?
Flexible Printed Circuit (FPC) is a highly reliable and excellent flexible printed circuit board made of polyimide or polyester film. It has the characteristics of high wiring density, lightweight, thin thickness, and good bendability.
What is a Fixed Inductor?
Fixed inductors are a classification of inductors according to their structure, and fixed inductors are commonly used inductive devices. An inductor with a fixed inductance is called a fixed inductor (or a fixed coil), and it can be a coil with a single layer, multiple layers, honeycomb type, or a magnetic core. These coils are winded on the magnetic core using a wire of corresponded diameter and they are packaged with epoxy resin or plastic according to the inductance and the maximum DC operating current.
Introduction to Inductive Reactance
Alternating current can also pass through the coil, but the inductance of the coil has an obstructive effect on the alternating current. This obstruction is called inductive reactance.
What is a Reed Relay?
A reed relay is a type of relay that uses an electromagnet to act directly on the reed-like contact of a reed switch contained within a glass envelope, typically bringing the reeds together to make contact when the electromagnet is powered.
What is a MOSFET?
MOSFET, short for Metal-Oxide-Semiconductor Field-Effect Transistor, is a field-effect transistor that can be widely used in analog circuits and digital circuits. MOSFETs can be divided into N-channel type with the majority of electrons and P-channel type with the majority of holes according to their "channel" polarity. They are usually called NMOSFET and PMOSFET.
What is a Force Sensor?
Force sensor (force sensor) is a component that converts the magnitude of force into related electrical signals. The force sensor can detect mechanical quantities such as tension, pressure, weight, torque, strain, and interior stress. It has become indispensable core component of power equipment, engineering machinery, various working machines, and industrial automation systems.
How does Lidar Work?
Lidar or LiDAR is an abbreviation for Light Detection and Ranging. Lidar is a radar that uses a laser as a radiation source. Lidar is the product of a combination of laser technology and radar technology.
What is an Accelerometer Sensor?
An accelerometer sensor is a sensor that can measure acceleration. It is usually composed of masses, dampers, elastic components, sensitive components, and adaptive circuits. In the process of acceleration, the sensor obtains the acceleration value by using Newton's second law, measuring the inertial force on the mass block. According to the different sensitive components of the sensor, common accelerometer sensors include capacitive, inductive, strain gauge, piezoresistive, piezoelectric and so on.
RF Modulator: Working Principle and Development Trend
An RF modulator is an electronic device that provides a baseband signal, which is used to convert radio frequency resources.There are many RF modulators available, but all functions work in a similar way.
What is a Ground Fault Circuit Interrupter?
A ground fault circuit interrupter(GFCI) is an electrical device installed to protect against severe electric shocks. It can also reduce electrocutions, minimize electrical burns and shock injuries, and detect ground faults, and interrupts the flow of electric current.
What is a Printed Circuit Board?
A printed circuit board(PCB) is the provider of electrical connections for electronic components. Printed circuit boards are often represented by "PCB", but cannot be called "PCB boards".
What is a Switched Reluctance Motor?
Switched reluctance motor is a type of speed-regulating motor developed after DC motor and brushless DC motor. Product power levels range from several watts to hundreds of kilowatts, and are widely used in household appliances, aviation, aerospace, electronics, machinery, and electric vehicles.
What is a DC-to-DC Converter?
DC-DC converter, also known as a DC-to-DC converter or DC transformer, is a circuit or electromechanical device that converts electrical energy. It can convert a direct current (DC) power source into a direct current power source (or approximate DC) of different voltages. Its power range is from very low (small batteries) to very high (high-voltage power transmission). The output voltage of some DC-DC converters has the same reference point as the input voltage, while the output voltage of some DC-DC converters is isolated from the input voltage.
What is AMOLED?
AMOLED is an active-matrix organic light-emitting diode. AMOLED is a display technology for mobile devices, digital cameras, media players, and television. It uses active matrices to address pixels and uses a special type of film technology, wherein the organic compound forms an electroluminescent material.
Optical Image Stabilization (OIS) Explained: Types and Working
In cameras or other imaging instruments, optical image stabilization (OIS) refers to the setting of optical components to avoid or reduce instrument jitter in the process of capturing optical signals, thereby improving image quality.
Solid-state Drive (SSD): Classification and Architecture
A solid-state drive (SSD) is a hard drive made of solid-state electronic memory chip arrays. SSD is composed of a control unit and storage unit (FLASH chip, DRAM chip). Solid-state drives are widely used in many fields such as military, vehicle, industrial control, video surveillance, network monitoring, network terminals, electric power, medical treatment, aviation, navigation equipment, and so on.
Near Field Communication (NFC) Explained: Working and Applications
Near Field Communication (NFC) is evolved from the integration of non-contact radio frequency identification (RFID) and interconnection technology. Devices using NFC technology can exchange data when they are close to each other. By integrating the functions of inductive card readers, inductive cards, and point-to-point communication on a single chip, applications such as mobile payment, e-ticketing, access control, mobile identification, and anti-counterfeiting can be realized by using mobile terminals.
What is a USB Flash Drive?
USB Flash Drive integrates disk storage technology, flash memory technology, and universal serial bus technology. The USB port is connected to the computer, which is the channel for data input/output. The master chip makes the computer identify the USB flash drive as a movable disk, which is the "brain" of the USB flash drive. The flash memory saves data. The PCB bottom plate connects the components together and provides a platform for data processing.
Wireless Charging Explained: Working and Standards
Wireless charging technology originates from wireless power transmission technology, which can be divided into low-power wireless charging and high-power wireless charging. Low-power wireless charging often uses electromagnetic induction, such as the Qi method for charging mobile phones. High-power wireless charging often uses resonance (most electric vehicle charging uses this method) from the power supply equipment (charger) to transfer energy to the device that uses electricity.
Graphics Card Explained: Classification, Working and Structure
A Graphics card (Video card, Display card, Video adapter) is one of the basic components of personal computers. It converts the display information required by the computer system to drive the display, which is an important component that connects the monitor and the PC motherboard, and is one of the important equipment of "human-machine". Its built-in parallel computing capability is also used for deep learning and other operations.
What is Universal Serial Bus (USB)?
Universal Serial Bus (USB) is a serial bus standard and a technical specification for input and output interfaces. It is widely used in information communication devices. The latest generation is USB4, and its transmission speed is 40Gbit/s, the three-stage voltage is 5V/12V/20V, the maximum power supply is 100W.
What is a Hard Disk Drive (HDD)?
Hard Disk Drive (HDD) is the main storage device of a computer. It consists of one or more aluminum or glass discs. These discs are covered with ferromagnetic material. The vast majority of hard drives are fixed hard drives, which are permanently sealed and fixed in the hard drive. With the development of hard disk drives, removable hard disk drives have also appeared, and they are becoming more and more popular.
What is a Wireless Network Adapter?
The wireless network adapter is actually a terminal wireless network device, which needs to be used for Internet access through the wireless connection network under the wireless coverage of the wireless local area network. With a wireless network adapter, it also needs a wireless network that can be connected, so it needs to be used with a wireless router or wireless AP.
Bluetooth Explained: Characteristics and Applications
Bluetooth is a global specification of wireless data and voice communication, which is a special close-range wireless technology for setting communication environments for fixed and mobile devices. Bluetooth allows some of the current portable mobile devices and computer devices to connect to the Internet without a cable and can be wirelessly accessing the Internet.
VRAM (Video RAM) Explained
VRAM (video RAM), also known as a frame buffer, is used to store the rendering data processed or about to be extracted by the graphics chip. Like computer memory, VRAM is a component used to store graphics information to be processed.
What is UWB (Ultra-wideband)?
UWB (Ultra-wideband) technology is a wireless carrier communication technology, which does not use a sinusoidal carrier, but uses the non-sinusoidal narrow pulse of the nanosecond level, so the spectrum range is wide.
How Fast is Wi-Fi 6?
Wi-Fi 6 ( IEEE 802.11.ax) is the sixth-generation wireless network technology and the name of the Wi-Fi standard. It is a wireless local area network technology created by the Wi-Fi Alliance based on the IEEE 802.11 standard. Wi-Fi 6 will allow communication with up to 8 devices with a maximum rate of 9.6Gbps.
MEMS Basics: System Features and Classifications
MEMS, also called micro-electro-mechanical system or micro-system, refers to high-tech devices with dimensions of a few millimeters or even smaller. The internal structure of MEMS is generally on the order of micrometers or even nanometers. A micro-electromechanical system is a micro-device or system that integrates micro-sensor, micro-actuator, micro-mechanical structure, micro-power supply, micro-energy, signal processing and control circuit, high-performance electronic integrated device, interface, and communication.
What is a Servo Drive?
Servo drive, also known as "servo controller" and "servo amplifier", is a kind of controller used to control servo motors. Its function is similar to that of frequency converters acting on ordinary AC motors, and it is part of the servo system. The servo drive is mainly used in high-precision positioning systems. Generally, the servo motor is controlled by three methods of position, speed, and torque to achieve high-precision transmission system positioning.
Introduction to Wireless Router
The wireless router is a router with a wireless coverage function for users to surf the Internet. The wireless router can be regarded as a repeater, which forwards the broadband network signal from the wall at home to the nearby wireless network devices (laptops, wifi-enabled mobile phones, tablets, and all devices with WIFI function) through the antenna.
What are the Types of Camera Lenses?
The camera lens is an indispensable component in the machine vision system, which directly affects the quality of the image. Cameral lenses can be divided into short focal length, medium focal length, and long focal length. From the field of view, there are wide-angle, standard, and telephoto lenses. In terms of structure, there are fixed-aperture fixed-focus lenses and manual-aperture fixed-focus lenses, auto-iris fixed-focus lens, manual zoom lens, automatic zoom lens, auto-iris electric zoom lens, electric three-variable lens, etc.
Introduction to Optical Zoom and Digital Zoom
Optical zoom relies on the structure of the optical lens to achieve zoom, that is, the lens of the camera is moved to zoom in and out of the scene to be shot, and the resolution and image quality will not change. The greater the optical zoom factor, the more distant objects can be captured. Digital zoom uses the processor in the digital camera to increase the area of each pixel in the picture to achieve the purpose of magnification.
Hydrogen Fuel Cell: Features, Working and Applications
A hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. The basic principle is the reverse reaction of electrolyzed water. Hydrogen and oxygen are supplied to the anode and the cathode respectively. After the hydrogen diffuses out through the anode and reacts with the electrolyte, electrons are released to the cathode through an external load.
What is a Surge Protection Device (SPD)?
A surge protection device (SPD), also called a surge protector, is an electronic device that provides safety protection for various electronic equipment, instruments, and communication lines. When a spike current or voltage is suddenly generated in the electrical circuit or communication circuit due to external interference, the surge protection device can conduct and shunt in a very short time, so as to prevent the surge from damaging other equipment in the circuit.
What are Motherboards?
The motherboard, also called the system board or mainboard, is one of the most basic and important components of a computer. The motherboard is generally a rectangular circuit board, on which is installed the main circuit system that composes the computer.
How to Use an External Hard Drive?
The external hard drive is a compact and portable hard drive storage which can be plugged in or unplugged at any time. It mainly uses USB or IEEE1394 interfaces. It can transmit data with the system at a higher speed. The IEEE 1394 interface transfer rate is 50-100 MB/s.
Comprehensive Introduction to Snapdragon 888
Snapdragon 888 is the mobile phone processor of Qualcomm Company. On December 1, 2020, at the Snapdragon Technology Summit held in Hawaii, Qualcomm announced the launch of the latest generation of flagship SOC-Qualcomm Snapdragon 888 5G mobile platform and Snapdragon X60 5G baseband.
Introduction to RAID (Redundant Arrays of Independent Disks)
RAID (Redundant Arrays of Independent Disks) means "a redundant array composed of independent disks". The RAID is the combination of many independent disks that combined into a large-capacity disk group. It uses the bonus effect of individual disks to provide data to enhance the performance of the entire disk system.
How to Increase Laptop Battery Life
The laptop battery is a battery in the laptop. Now a laptop uses a rechargeable battery is one of the advantages of laptops relative to desktops. The battery is to make the laptop workmaken without an AC power supply. It is mainly to maintain energy in the electrical cell in it, or that the quality of the battery determines the quality of the battery.